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    NPCC to build derrick lay vessel

    Vessel & ROV News // June 15, 2010

    The DLS 4200 will be built at Zhenhua heavy Industries in China.

    Abu Dhabi-based National Petroleum Construction Company (NPCC) has contracted Chinese shipyard Zhenhua Heavy Industries for the construction of their DLS 4200, a derrick lay vessel developed by Dutch design office Ulstein Sea of Solutions which combines double joint S-lay capabilities with a 4200 sT lifting capacitiy.

    DLS 4200 is designed to operate worldwide and is equipped with a 10-point mooring system to operate in the Arabian Gulf and India. To meet future market requirements, the design has already been prepared for DP2 upgrade to minimize the technical impact and shorten the upgrade process.

    “After closely working together with NPCC in the design of the vessel, it is very rewarding to see the design now being put into reality by awarding the construction contract to ZPMC. We are confident that the vessel will prove to be a very competitive and valuable asset to NPCC to meet their strategic goals”, said Bob Rietveldt, managing director at Ulstein Sea of Solutions.

    The DLS 4200 is designed aiming for maximum efficiency and cost effectiveness and features a centre double joint firing line to optimize pipelaying operations that are not hampered by vertical motions due to roll.

    Ulstein Sea of Solutions’ distinctive feature of separating the pipelay functionality from lifting operations is also incorporated in the DLS 4200. The firing line and the double joint fabrication areas are located on the freeboard deck, which is completely covered by the main deck. This provides a clean and dry environment for the pipelay equipment and an unobstructed main deck for lifting operations.

    The Amclyde Model 80 main crane is capable of lifting 4,200 sT (3,800 tonne) at a 125ft radius over the stern in tie-back mode and 4,200 sT at 95ft without tie-back. In full revolving mode the crane is able to lift 3635 sT (3,300 tonne) with an outreach of 130ft.

    The vessel features two fixed pitch shaft driven main propellers of 5,500kW each which will allow for a cruising speed of 13 knots. To upgrade the vessel to DP2 five (5) retractable azimuth thrusters of 3,500kW each are required.

    Main dimensions of the vessel are:

    Loa     196.9 m  Draught (design)    7.5 m
    Lpp     191.7 m  Service speed            13 kn
    Beam (moulded)   43.4 m  Installed power (moored)  4 x 5,530 kW
    Depth (moulded)   19.6 m  Installed power (future DP)  6 x 5,530 kW.


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